function check_user(){
    var fname=document.getElementById('iduser').value=="";
    var  fpass=document.getElementById('idpass').value=="";
    var email=document.getElementById('idemail').value=="";
    if(fname){
        alert('Please enter first name!');
        document.getElementById('iduser').style.border = '1px solid red';
        return false;
    }else if(fpass){
        alert('Please enter password!');
       
        document.getElementById('idpass').style.border = '1px solid red';
        return false;
        
    }
    else if(email){
        alert('Please enter email!');
       
        document.getElementById('idpass').style.border = '1px solid red';
        return false;
        
    }
    else{
        document.getElementById(val).style.display='none';
        return true;
    }

}

function check_login(){
       
    var fname=document.getElementById('iduser').value=="";
    var  fpass=document.getElementById('idpassword').value=="";
     
    if(fname){
        alert('Please enter first name!');
        
        document.getElementById('iduser').style.border = '1px solid red';
        return false;
    }else if(fpass){
        alert('Please enter password!');
       
        document.getElementById('idpassword').style.border = '1px solid red';
        return false;
        
    }
    else{
        document.getElementById(val).style.display='none';
        return true;
    }
  
}

function check_student(){
           
    var fstudent=document.getElementById('student').value=="";
    var  fdob=document.getElementById('dob').value=="";
    var  fphone=document.getElementById('phone').value=="";
    var femail=document.getElementById('stu_email').value=="";
    if(fstudent){
        alert('Please enter first name!'); 
        document.getElementById('student').style.border = '1px solid red';
        return false;
    }else if(fdob){
        alert('Please enter date of birth!');
        document.getElementById('dob').style.border = '1px solid red';
        return false;
    }else if(fphone){
        alert('Please enter phone!');
        document.getElementById('phone').style.border = '1px solid red';
        return false;
    }else if(femail){
        alert('Please enter  email!');
        document.getElementById('stu_email').style.border = '1px solid red';
        return false;
    }
    
    else{
        document.getElementById(val).style.display='none';
        return true;
    }
    
       
}

//validation email

function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}

function ValidateForm(){
	var emailID=document.frmSample.txtEmail
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }